<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <input type="text" v-model="a">
    <select>
      <option value="+">+</option>
      <option value="-">-</option>
      <option value="*">*</option>
      <option value="/">/</option>
    </select>
    <input type="text" v-model="b"><br>

    <input type="button" @click="handle" value="计算">
  </div>
  <script src="../js/vue.js"></script>
  <script>
    const vm = new Vue({
      el: "#app",
      data: {
        a: "",
        b: "",
        c: "",
        result: ""
      },
      methods: {
        handle() {}
      }
    });

  </script>
</body>

</html>
